Grinder or sharpener for knives, &amp;c.



ROSE. GRINDER 0R SHARPENER FOR KNIVES, &c.

APPLl'CATjON FILED SEPT. 23,.1920.

Patented Nov. 29, 1921 m r I I I n n u 1 WITNESSES UNITED STATES PATENT. Ores JOHN MITCHELL RCSE, or PHILADELPHIA, PENNSYLVANIA.

GRINDER OR SHARPEN'ER FUR KNIVES, 8w."

Specification of Letters Patent. Pigmented NOV QQ, 1921.

jApplication filed September 23, 1920. Serial No. 412,268.

2" 0 all whom it may concern.

Be it known that I, JOHN MI CHELL Rosa, citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Grinder or Sharpener for Knives, &c., of which the following is a specification.

My invention consists of a grinder or sharpener for knives, etc., the same embodying a Wheel of the form of an annulus or peripheral rim of grinding or sharpening material, a separate web of disk-like form in said wheel, and aguard at the side of said web and wheel adapted to press a blade,- etc., resiliently against said wheel, thus ef fectively grinding or sharpening said blade, etc, the motions of the latter serving to r0- tate said wheel and guard, the webbing loosely fitted Within said wheel and unattached thereto, while, however, firmly sustaining'the same by engagement with the inner periphery thereof, and other details are provided as hereinafter described, thus simplifying the device and reducing the ex- .iense thereof.

It consists further of novel mountings for the members of the device whereby said members are steadily held in their positions and prevented from interfering with each other during the reciprocations of said members, and the device will not contract or spread.

The invention is satisfactorily illustrated in the accompanying drawing, but the important instrumentalities thereof may be varied, as long as they are included in the scope of the claims. 7 1

Figure 1 represents a side elevation of a grinder or sharpener embodying my invention.

Fig. 2 represents a section line a2m Fig. 1. p

Fig. 3 represents a diametrical section of detached portions.

Fig. 4 represents a partial side elevation and partial longitudinal section of the axial portions of the device detached. I

Fig. 5 representsa vertical section of the bracket or stand of the device, and the axial portions of the latter mounted on said bracket.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings.

1 designates a grinding or sharpening thereof on the wheel of the form of an annulus or ring-like structure, that is to say, a circular hollow body of grinding or sharpening material in the hollow of which is fitted loosely the annular Web 2, ofthe form of a disk of mate rial adapted to sustain said body from with- V in the same on the inner periphery thereof and retaining its position by frictional contact with said periphery.

In the center of saidweb is the opening 3 which receives freely the .thimble 4: as the axis of said web, and consequently of the wheel 1. On said thimble are fitted freely the concave-convex guards 5, the same being on opposite sides of said web and wheel and are adapted to have their inner sides adapted to press a blade against the outersides of body of said wheel. i

Ofn said thimble exterior of the guards 5 are fitted freely the annular washers 6, between which and said guards arethe springs 7 which serve to press said guards against the sides of the wheel, while allowing the guards to. yield when a blade to be'ground or sharpened is introduced between said wheel and'a guard butserving to press the side ofthe blade against the disk-body of said-wheel. The washersfi arecup shaped and so serve to 'in'close the springs 7 and thereby guard the hand of thegoperator from possible contact with the raw ends of said springs.

On the endsof the thimble i are the heads saidthimble are retained in position on the thimble and prevented'from lateral shiftingthereon. V I In the thimble is the spindle or axle '9 whose ends are fitted in and secured by heads 10-to the bracket 11 which may be placed on and connected with a table or any suitable support, it being noticed in Fig. 4 that the thimble and spindle are inftheir normal condition, and asin Figs. 2 and-5 one end of the thimble has its head formed thereonafterjth-e washers-and other members are placed on the thimble and one of the heads of the spindle is formed on the same when said spindle is fitted on the bracket.

It will be seen that a blade is placed between the sideof the wheel and the adjacent guard. The blade is then drawn to and fro the whereby reciprocating motions are imparted to the guard and wheel and then the blade will be ground or sharpened by the wheel, the blade furnishing the power by which the wheel receives its rotations in opposite directions.

I am aware that a web has been embedded in the inner periphery of a grinding and sharpening wheel of the character employed by me, but such embedded web requires it to be made of a greater diameter and thus more material so as to obtain purchase within the wheel, while the web has to be molded in the wheel, and fixed firmly to its bearing or axle, which add greatly to the expense of the device. The web and the wheel are made each complete by itself. Then the web is slipped into the wheel and takes hold directly on the inner periphery of the latter by friction as has been stated, and avoids cracking or chipping of the side walls of the groove heretofore employed in articles of the class where the peripheral portion of the web is embedded in such groove which is liable to occur owing to side pressure on the wheel during the sharpening operation when the wheel receives a certain amount of such side pressure, and so pulls with it the peripheral portion of the web which portion is thus liable to be twisted and loosened in said groove.

It will be noticed that the heads 8 of the thimble prevent the washers 6 from rotating against the sides of the bracket 11 and inward closin of the'latter, while the heads 10 of the spindle 9 prevents outward spreading of the sides of the brackets. Attention is drawn to the fact that as the grinding or sharpening wheel is composed of a hollow circular body and the web or disk 2 occupies the hollow, thereof, and its periphery contacts with the inner periphery of said body to support the same, there is a great saving in the amount of material of which said body is formed, and there is also a saving of expense in making the support of said body of the separate disk stated, the latter being inserted in position in lateral direction indicated by the arrow Fig.

It will be seen also that the heads 10 of the spindle 9 are on the outer faces of the side arms of the bracket and the heads 8 of the tubular thimble l are on the inner faces of said arms, and so both the spindle and thimble are connected with the bracket by said heads and without liability to be displaced therefrom while, as the respective heads engage the opposite faces of said arms,

the character stated, a grinding or sharpen ing wheel consisting of ahollow body of grinding or sharpening material, a disk-.

shaped web in the hollow of said body adapted to engage frictionally the inner periphery of said hollow body and sustain from within, said hollow body simply by frictional contact with the inner periphery thereof, a guard on the side of said wheel, a tubular axle for said web and guard, a resilient member on said support adapted to press said guard inwardly against said body a spindle in said axle, a mounting for said spindle, and means on said spindle and said axle for retaining them in position on said mounting.

In a grinding or sharpening device of the character stated, a grinding or sharpening wheel of the form of a hollow body, a disk-shaped web in the hollow of said body adapted to sustain the latter on the inner periphery thereof, a guard on the side of said wheel, a tubular member onwhich said web and guard are mounted, a spindleshaped member adapted to occupy said tubular member, and a supporting bracketshaped member for said spindle-shaped member, the latter and said tubular member having on their terminals means for preventing their displacement from said bracket-shaped member. 4. In a grinding or sharpening device of the character stated, a grinding or sharpening wheel, a web supporting the same, a laterally-resilient guard on each side ofv said web and wheel, a tubular thimble on which said guards and wheel are mounted, said thimble having heads on the ends thereof, a bearing spindle in said tubular thimble, and a support for the ends of said bearing spindle, said ends having heads thereon.

JOHN MITCHELL ROSE. WVitnesses:

JOHN A. VVEIDERSHEIM,

N. BUSSINGER. 

